New in version 4.2.

KeyVault.addKeyAlternateName(UUID, keyAltName)

Adds the keyAltName to the keyAltNames array of the data encryption key with UUID.

keyAltName must be unique among all keys in the key vault. The getKeyVault() method automatically creates a unique index on the keyAltNames field with a partial index filter for only documents where keyAltNames exists.

addKeyAlternateName() has the following syntax:

keyVault = db.getMongo().getKeyVault()
UUID("<UUID string>"),
Returns:Returns the previous version of the data encryption key document.

Returns null if no data encryption key has the specified UUID().

The mongo client-side field level encryption methods require a database connection with client-side field level encryption enabled. If the current database connection was not initiated with client-side field level encryption enabled, either:

The following example is intended for rapid evaluation of client-side field level encryption. For specific examples of using KeyVault.addKeyAlternateName() with each supported KMS provider, see Manage a Data Encryption Key's Alternate Name.

Configuring client-side field level encryption for a locally managed key requires specifying a base64-encoded 96-byte string with no line breaks. The following operation generates a key that meets the stated requirements and loads it into the mongo shell:

TEST_LOCAL_KEY=$(echo "$(head -c 96 /dev/urandom | base64 | tr -d '\n')")
mongo --nodb --shell --eval "var TEST_LOCAL_KEY='$TEST_LOCAL_KEY'"

Create the client-side field level encryption object using the generated local key string:

var ClientSideFieldLevelEncryptionOptions = {
"keyVaultNamespace" : "encryption.__dataKeys",
"kmsProviders" : {
"local" : {
"key" : BinData(0, TEST_LOCAL_KEY)

Use the Mongo() constructor to create a database connection with the client-side field level encryption options. Replace the mongodb:// URI with the connection string URI of the target cluster.

encryptedClient = Mongo(

Retrieve the KeyVault object and use the KeyVault.addKeyAlternateName() method to add a new key alternate name to the data encryption key with matching UUID. The specified key alternate name must be unique:

keyVault = encryptedClient.getKeyVault()

If successful, addKeyAlternateName() returns the previous version of data encryption key document:

"_id" : UUID("b4b41b33-5c97-412e-a02b-743498346079"),
"keyMaterial" : BinData(0,"PXRsLOAYxhzTS/mFQAI8486da7BwZgqA91UI7NKz/T/AjB0uJZxTvhvmQQsKbCJYsWVS/cp5Rqy/FUX2zZwxJOJmI3rosPhzV0OI5y1cuXhAlLWlj03CnTcOSRzE/YIrsCjMB0/NyiZ7MRWUYzLAEQnE30d947XCiiHIb8a0kt2SD0so8vZvSuP2n0Vtz4NYqnzF0CkhZSWFa2e2yA=="),
"creationDate" : ISODate("2019-08-12T21:21:30.569Z"),
"updateDate" : ISODate("2019-08-12T21:21:30.569Z"),
"status" : 0,
"version" : NumberLong(0),
"masterKey" : {
"provider" : "local"
"keyAltNames" : [

To view the current version of the data encryption key document, use KeyVault.getKey() specifying the _id of the returned document or KeyVault.getKeyByAltName() specifying one of the keyAltNames.

See also:
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